In this paper, Siljak's extension to Mitrovic's method has been used to determine the parameters of a regulator used for improving the steady-state stability of alternators. This is accomplished by computing the stable limits of two of the coefficients of the characteristic equation resulting from the linearized equations of a synchronous machine, tie line and voltage regulator. The method is illustrated by taking a suitable example with its results verified by applying the Routh-Hurwitz criterion